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Paper Abstract and Keywords
Presentation 2025-12-04 14:10
On achievable gain of coherent joint transmission with distributed units under synchronization jitter
Kai Nakamura (Tohoku Univ.), Kenichi Takizawa (NICT) WBS2025-55 ITS2025-34 RCC2025-54
Abstract (in Japanese) (See Japanese page) 
(in English) As the use cases of radio communication become more diverse, there is a growing demand for highly reliable communications that supports precise operations such as collaborative robot. Therefore, to enhance the gain in scenarios where a single link suffers from significant propagation loss and to improve reliability through redundancy in the number of links, coherent joint transmission (CJT)—a technique in which multiple distributed units (DUs) cooperatively perform transmission—has attracted considerable attention. Specifications related to CJT in mobile radio communications have also been standardized in 3GPP. Achievable gain in CJT is fundamentally limited by the number of DUs; however, the loss from this the upper bound on the gain is influenced not only by the estimation errors of the radio propagation characteristics between each DUs and the device, but also by the synchronization jitter among the DUs. In this paper, we investigated the impact of synchronization jitters on the achievable gain in CJT when employing wireless two-way interferometry (Wi-Wi) for synchronization among DUs.
Keyword (in Japanese) (See Japanese page) 
(in English) Wireless Two-way Interferometry / Coherent Joint Transmission / Time Synchronization / Jitter / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 266, RCC2025-54, pp. 107-112, Dec. 2025.
Paper # RCC2025-54 
Date of Issue 2025-11-26 (WBS, ITS, RCC) 
ISSN Online edition: ISSN 2432-6380
Copyright
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reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF WBS2025-55 ITS2025-34 RCC2025-54

Conference Information
Committee RCC ITS WBS  
Conference Date 2025-12-03 - 2025-12-04 
Place (in Japanese) (See Japanese page) 
Place (in English) B-Con Plaza (Beppu) 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCC 
Conference Code 2025-12-RCC-ITS-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) On achievable gain of coherent joint transmission with distributed units under synchronization jitter 
Sub Title (in English)  
Keyword(1) Wireless Two-way Interferometry  
Keyword(2) Coherent Joint Transmission  
Keyword(3) Time Synchronization  
Keyword(4) Jitter  
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1st Author's Name Kai Nakamura  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Kenichi Takizawa  
2nd Author's Affiliation NICT (NICT)
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Speaker Author-1 
Date Time 2025-12-04 14:10:00 
Presentation Time 25 minutes 
Registration for RCC 
Paper # WBS2025-55, ITS2025-34, RCC2025-54 
Volume (vol) vol.125 
Number (no) no.264(WBS), no.265(ITS), no.266(RCC) 
Page pp.107-112 
#Pages 6 
Date of Issue 2025-11-26 (WBS, ITS, RCC) 

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